Please give me a call and let me know you will come back for dinner.A. ifB. becauseC. unti

问题补充：

Please give me a call and let me know you will come back for dinner.

A. if

B. because

C. until

D. unless

答案：

(答案→)A. if

B. because

C. until

D. unless

解析：if是否，如果；because因为；until 直到；unless除非，如果不。句意：请给我打个电话，让我知道你是否会来吃饭。结合语境可知选A。